<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <div id="app">
    <h2>总价格:{{totalprice}}</h2>
  </div>
  <script src="../js/vue.js"></script>
  <script>
    const app = new Vue({
      el: '#app',
      data: {
        books: [
          { id: 110, name: 'Unix编程艺术', price: 119 },
          { id: 110, name: '代码大全', price: 119 },
          { id: 110, name: '深入理解计算机原理', price: 98 },
          { id: 110, name: '现代操作系统', price: 87 },
        ]

      },
      computed: {
        totalprice: function () {
          let result = 0
          for (let i = 0; i < this.books.length; i++) {
            result += this.books[i].price
          }
          return result
        }
      },
      methods: {},
    })
  </script>
</body>

</html>